IQI for double wall single image

[smart143]

I have a 1.5" sch 160 (7.16 mm) pipe to Flange weld joint, external re-reinforcement is 1.5 mm & inter weld protrusion is flush with ID.
Customer specification is asking to use EN 462-1 wire type IQT with 2% minimum sensitivity.However RT is to be done as per ASME sec V.

I tried X-Ray with double wall single image technique (D-2 film) but not able to see 0.2 mm wire image on weld. Can somebody suggest a technique to achieve 2" sensitivity

 

[JR97]

Smart,

Per ASME Section V, wall thickness of 7.16mm plus reinforcement of 1.5mm results in single wall thickness of 8.6mm. Per Table T-276, you need to see the #6 wire (.25mm) not the #5 wire (.20mm).

If you are still having problems, lower the KV and/or shoot for darker densities.

JR0097

 

[SectionIX]

Along with the above, increase your source to object distance as this should also reduce your geometric unsharpness. If using the 6EN pack, the 0.25mm wire will be the smallest diameter in the pack; Accordingly, the essential wire will easier to see due to the tendency of your eyes being drawn to the essential wire location due to placement of the thicker wires.

Finally, place the IQI on a separate block as allowed by ASME Section V, T277-1(a).


When, due to part or weld configuration or size, it is not
practical to place the IQI(s) on the part or weld, the IQI(s)
may be placed on a separate block. Separate blocks shall
be made of the same or radiographically similar materials
(as defined in SE-1025) and may be used to facilitate IQI
positioning. There is no restriction on the separate block
thickness, provided the IQI/area-of-interest density tolerance
requirements of T-282.2 are met.